Even if you choose to keep three days worth of changes uncommitted, you're still doing local backups of your machine anyways, right? He'd be facing the same amount of information loss if his hard drive died.
If you're on OS X, Time Machine will get you back to where you were recently (except if your home directory is encrypted, then it backs up on logout). Or use Dropbox/SpiderOak/other to keep the last n versions of your changes.
If you're on OS X, Time Machine will get you back to where you were recently (except if your home directory is encrypted, then it backs up on logout). Or use Dropbox/SpiderOak/other to keep the last n versions of your changes.